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    OPTICAL HEAD AND OPTICAL RECORDER
    42.
    发明公开
    OPTICAL HEAD AND OPTICAL RECORDER 失效
    OPTISCHER KOPF UND OPTISCHESAUFZEICHNUNGSGERÄT

    公开(公告)号：EP0831471A4

    公开(公告)日：1999-11-24

    申请号：EP97905471

    申请日：1997-03-10

    申请人： SEIKO EPSON CORP

    发明人： YONEKUBO MASATOSHI ,  ARIMURA TOSHIO ,  MIYAZAWA TAKAO

    IPC分类号： G11B7/00 ,  G11B7/005 ,  G11B7/12 ,  G11B7/13 ,  G11B7/135 ,  G11B20/10 ,  G11B7/09

    CPC分类号： B82Y10/00 ,  G11B7/005 ,  G11B7/123 ,  G11B7/131 ,  G11B7/133 ,  G11B7/1353 ,  G11B7/1367 ,  G11B7/1381 ,  G11B20/10009 ,  G11B2007/0006 ,  G11B2007/13727

    摘要： An optical head and an optical recorder with which data can be recorded/reproduced onto/from a conventional CD-R without a problem and, further, data can be recorded/reproduced onto/from an optical recording medium of DVD standard which meets the requirements of the high recording density by employing a semiconductor laser beam which has a relatively longer wavelength than the track pitch of the optical recording medium and the optical super-resolution technique. Moreover, since a semiconductor laser beam which has a relatively longer wavelength than the track pitch of the optical recording medium can be employed by the optical head and the optical recorder, the limitation of the high density recording can be broken through and the optical pickup device and the optical recorder can record/reproduce data of the high recording density at a low cost and with the high reliability and can meet the requirements of the much higher recording density in future.

    摘要翻译： 通过使用相对于光记录介质的轨道间距相对长的波长的半导体激光器和光学超分辨率技术，提供了一种光学头和光学记录装置，其允许诸如记录和再生等处理 来自常规的CD-R，并且处理具有高记录密度的DVD标准的光记录介质。 在本发明的光头和光记录装置中，可以使用相对于光记录介质的轨道间距具有较长波长的半导体激光器。 因此，本发明提供了一种光学头和光学记录装置，其克服了朝向更高密度的努力的限制，允许以高可靠性以低成本记录和再生高记录密度。 本发明还提供一种光头和光学记录装置，能够应付将来更高密度的趋势。

    Automatically adapting forward or reversed biased photodiode detection circuit
    44.
    发明公开
    Automatically adapting forward or reversed biased photodiode detection circuit 有权
    自动适应正向或反向偏置光电二极管检测电路

    公开(公告)号：EP0927888A1

    公开(公告)日：1999-07-07

    申请号：EP98403232.6

    申请日：1998-12-21

    申请人： Deutsche Thomson Brandt

    发明人： Buechler, Christian ,  Lehr, Steffen ,  Zucker, Friedhelm

    IPC分类号： G01R31/28 ,  G11B7/13

    CPC分类号： G11B7/126 ,  G01R31/2635 ,  G11B7/13 ,  H01S5/042 ,  H01S5/06825 ,  H01S5/0683

    摘要： A photodiode detection circuit is used to automatically identify a type of photodiode circuit connected to it (34, 35). The photodiode circuit comprises at least a photodiode. Once the type of photodiode circuit has been identified by applying a current to it (44) and evaluating a voltage occuring at an input of the detection circuit (45) the photodetection circuit adapts itself to it, e.g. a reverse biasing voltage is / isn't applied (48) to the photodiode of the photodiode circuit. The result is a photodiode detection circuit which uses a forward or a reversed biased photodiode. The photodiode detection circuit is now in a state to measure light falling on the photodiode. The detection circuit may be part of a light intensity monitoring and controlling circuit which allows to regulate the intensity of a laser beam in an optical disk reading / recording device.

    摘要翻译： 光电二极管检测电路用于自动识别与其连接的光电二极管电路的类型（34,35）。 光电二极管电路至少包括光电二极管。 一旦光电二极管电路的类型已通过向其施加电流（44）并且评估在检测电路（45）的输入处出现的电压而被识别，光电检测电路自身适应于它，例如， 反向偏置电压不被施加（48）到光电二极管电路的光电二极管。 其结果是使用正向或反向偏置光电二极管的光电二极管检测电路。 光电二极管检测电路现在处于测量落在光电二极管上的光的状态。 检测电路可以是光强度监视和控制电路的一部分，其允许调节光盘读取/记录装置中的激光束的强度。

    Optical device
    46.
    发明公开
    Optical device 审中-公开
    Optische Vorrichtung

    公开(公告)号：EP0910075A2

    公开(公告)日：1999-04-21

    申请号：EP98119313.9

    申请日：1998-10-13

    申请人： SONY CORPORATION

    发明人： Mizuno, Takeshi

    IPC分类号： G11B7/12 ,  G11B7/135 ,  G11B7/13 ,  G11B7/09

    CPC分类号： G11B7/131 ,  G11B7/0901 ,  G11B7/123 ,  G11B7/133 ,  G11B7/1362 ,  G11B7/22

    摘要： In an optical device such as an optical pickup or the like, the number of optical assemblies may be reduced, an alignment required when the optical assemblies are disposed may be simplified, the whole of the device may be simplified and miniaturized, a tracking signal such as a tracking error signal or the like may be stably obtained relative to optical recording media having various pit depths, and the optical device may be manufactured with ease by the semiconductor process.
    An optical device (10) includes an irradiated portion (2) formed of an optical recording medium in which a pit (P) is formed on a reflection surface, a semiconductor unit (7) in which a semiconductor laser (LD), a semiconductor structure (4) and a photo-detection element (PD) are formed on the same semiconductor substrate (1), and a converging means (3) for converging a light (LF) emitted from the semiconductor laser (LD) and irradiating the same on the irradiated portion (2) and further converging a returned light (LR) reflected from the irradiated portion (2). The semiconductor structure (4) is formed near the confocal of the converging means (3) and includes at least three reflection surfaces (M 1 , M 2 , M 3 ). The photo-detection element (PD) includes a first detection element (PD R ) for receiving a returned light LR reflected on the second reflection surface (M2) and a second detection element (PD L ) for receiving the returned light (LR) reflected on the third reflection surface (M3), wherein a first detection signal which results from detecting a diffracted light from one pit edge of the pit (P) by the first detection element (PD R ) and a second detection signal which results from detecting the diffracted light from one pit edge of the pit by the second detection element (PD L ) are obtained, and the first and second detection signals are computed to generate a tracking error signal (TE).

    摘要翻译： 在诸如光学拾取器等的光学装置中，可以减少光学组件的数量，可以简化当配置光学组件时所需的对准，整个装置可以被简化和小型化，跟踪信号如 作为跟踪误差信号等，相对于具有各种凹坑深度的光记录介质，可以稳定地获得，并且可以通过半导体处理容易地制造光学器件。 光学装置（10）包括由反射面上形成凹坑（P）的光记录介质形成的照射部分（2），半导体激光器（LD），半导体 在同一半导体衬底（1）上形成结构（4）和光检测元件（PD），以及用于会聚从半导体激光器（LD）发射的光（LF）并照射它们的会聚装置（3） 在照射部分（2）上并且进一步会聚从照射部分（2）反射的返回光（LR）。 半导体结构（4）形成在会聚装置（3）的共焦点附近，并且包括至少三个反射面（M1，M2，M3）。 光检测元件（PD）包括用于接收在第二反射表面（M2）上反射的返回光LR的第一检测元件（PDR）和用于接收在第二反射表面（M2）上反射的返回光（LR）的第二检测元件 第三反射面（M3），其中通过由第一检测元件（PDR）检测来自凹坑（P）的一个凹坑边缘的衍射光产生的第一检测信号和由检测衍射光的衍射光产生的第二检测信号 获得第二检测元件（PDL）的凹坑的一个凹坑边缘，并且计算第一和第二检测信号以产生跟踪误差信号（TE）。

    Optical head
    49.
    发明公开
    Optical head 失效
    Optischer Kopf

    公开(公告)号：EP0814467A2

    公开(公告)日：1997-12-29

    申请号：EP97401449

    申请日：1997-06-20

    申请人： NEC CORP

    发明人： TSUYOSHI NAGANO

    IPC分类号： G11B7/09 ,  G11B7/12 ,  G11B7/13 ,  G11B7/135

    CPC分类号： G11B7/131 ,  G11B7/0943 ,  G11B7/123 ,  G11B7/1353 ,  G11B7/1356 ,  G11B7/1365

    摘要： Disclosed is an optical head, which has: a light-generating means which emits linearly polarized light; a lens which converges the light emitted from the light-generating means on a medium; a light-detecting means which receives the light reflected on the medium; a quarter-wave plate which is disposed between the light-generating means and the lens and rotates by pi /2 radian a polarization direction of the linearly polarized light when going and returning through the quarter-wave plate; a polarizing diffractive element which is disposed between the light-generating means and the quarter-wave plate, the polarizing diffractive element transmitting the light travelling from the light-generating means to the quarter-wave plate and diffracting the light travelling from the quarter-wave plate to the light-generating means by using a difference in polarization direction; and a polarizing beam splitter which is disposed among the light-generating means, the light-detecting means and the polarizing diffractive element, the polarizing beam splitter directing the light from the light-generating means to the polarizing diffractive element and directing the light from the polarizing diffractive element to the light-detecting means by using a difference in polarization direction; wherein the light-detecting means receives the light diffracted by the polarizing diffractive element and the light transmitted through the polarizing diffractive element.

    摘要翻译： 公开了一种光学头，其具有：发射线性偏振光的光产生装置; 将从光发生装置发射的光会聚在介质上的透镜; 接收介质上反射的光的光检测装置; 四分之一波片，其设置在光发生装置和透镜之间，并且在行进和返回通过四分之一波片时以π/ 2弧度旋转线偏振光的偏振方向; 偏振衍射元件，其设置在光发生装置和四分之一波片之间，偏振衍射元件将从光发生装置行进的光传输到四分之一波片，并衍射从四分之一波片传播的光 通过使用偏振方向的差异将光线照射到光产生装置; 以及设置在光生成装置，光检测装置和偏振衍射元件之间的偏振分束器，偏振分束器将来自光生成装置的光引导到偏振衍射元件，并将来自 通过使用偏振方向的差异将偏振衍射元件偏振到所述光检测装置; 其中光检测装置接收由偏振衍射元件衍射的光和透过偏振衍射元件的光。

    Optical pickup device, optical disk recording/reproducing apparatus, and method of generating focus error signal
    50.
    发明公开
    Optical pickup device, optical disk recording/reproducing apparatus, and method of generating focus error signal 失效
    一种光学拾取装置，记录/再现用于产生聚焦误差信号的光盘和方法的装置

    公开(公告)号：EP0777217A2

    公开(公告)日：1997-06-04

    申请号：EP96119301.8

    申请日：1996-12-02

    申请人： SHARP KABUSHIKI KAISHA

    发明人： Ueyama, Tetsuo

    IPC分类号： G11B7/09 ,  G11B7/13

    CPC分类号： G11B7/131 ,  G11B7/08511 ,  G11B7/0909 ,  G11B7/0916 ,  G11B7/0943 ,  G11B7/0945 ,  G11B7/133 ,  G11B7/1353 ,  G11B2007/0013

    摘要： Light from a semiconductor laser is converged by an objective lens onto an optical disk, and return light thereof is directed to a light receiving element by a three-division hologram element. The light receiving element includes a two-division main light receiving region for detecting a focus error signal and sub light receiving regions respectively provided on both sides of the main light receiving region for compensating the focus error signal. Based on output signals of the above main and sub light receiving regions, a focus error signal is detected. Note that it is arranged that the sub light receiving regions receive the return light from the optical disk and hence output signals only when the objective lens defocuses being positioned outside a dynamic range. Therefore, with the use of outputs of the sub light receiving regions, the focus error signal is quickily converged to 0, when the objective lens is positioned outside the dynamic range. As a result, even during a focus servo with respect to a multilayer optical disk wherein recording layers are provided at small intervals, it is possible to obtain an accurate focalizing position of the objective lens since respective focus error signals, obtained with respect to each recording layer, do not interfere each other.

    摘要翻译： 从半导体激光器的光被物镜会聚到走上光盘上，并通过一个三分全息元件返回它们的光被引导至光接收元件。 光接收元件包括一个二分主的光接收区域，用于检测分别设置在主光接收区域，用于补偿的聚焦误差信号的一个bothsides聚焦误差信号和子光接收区。 基于上述主，副光接收区域的输出信号，检测聚焦误差信号。 注意做到了被布置做了子光接收区接收来自光盘的返回光，并只有当物镜的散焦被定位的动态范围以外因此输出信号。 因此，与使用的接收区域的副光的输出，聚焦误差信号被quickily收敛到0，当物镜被定位在动态范围之外。 其结果是，即使是在相对于聚焦伺服，以多层光盘worin记录层以小的间隔设置，也能够得到上自respectivement聚焦误差信号的物镜的准确focalizing位置，所获得的关于每个记录 层，不干扰海誓山盟。